<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
      
    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格区 -->
      <tree-table class="tree-table" :data="catelist" :columns="columns"
        :selection-type="false" :expand-type="false" 
        show-index index-text="#" border>
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope" >
          <i class="el-icon-success" v-if="scope.row.cat_deleted === false" 
           style="color:lightgreen"></i>
          <i class="el-icon-error" v-else style="color:red"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0 ">一级</el-tag>
          <el-tag type="success" size="mini" v-else-if="scope.row.cat_level===1">二级</el-tag>
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button @click="editCataShow(scope.row)"
            type="primary" icon="el-icon-edit" 
            size="mini" >
            编辑
          </el-button>
          <el-button @click="deleteCataForm(scope.row)"
            type="danger" icon="el-icon-delete" 
            size="mini">
            删除
          </el-button>
        </template>
      </tree-table>
      <!-- 分页区 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum"
        :page-sizes="[3, 5, 8, 12]"
        :page-size="querInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total=" total">
      </el-pagination>

    </el-card>

    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      @close="addCataDialogClosed"
      width="50%">
      <el-form :model="addCateForm" :rules="cateFormRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类:">
          <!-- props用来指定配置对象 -->
          <!-- options用来指定数据源 -->
          <!-- v-model绑定一个数组 -->
          <el-cascader ref="addCascader"
            style="width=50%"
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCataChange"
            clearable
            ></el-cascader>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="editCateDialogVisible"
      @close="editCataDialogClosed"
      width="50%">
      <el-form :model="editCateForm" :rules="cateFormRules" ref="editCateFormRef" label-width="100px">
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCata">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data(){
    return {
      //查询条件
      querInfo:{
        type:3,
        pagenum:1,
        pagesize:5
      },
      //商品分类的数据列表，默认为空
      catelist:[],
      //总数据
      total:0,
      //为table指定列的定义
      columns:[{
        label:'分类名称',
        prop:'cat_name'
      },{
        label:'是否有效',
        //表示将当前列定义为模板列
        type:'template',
        //表示当前这一列使用的模板名称,用于定义作用域插槽
        template:'isok'
      },{
        label:'排序',
        type:'template',
        template:'order'
      },{
        label:'操作',
        width:200,
        type:'template',
        template:'opt'
      }],
      //控制添加分类的显示与隐藏
      addCateDialogVisible:false,
      //添加分类的表单数据对象
      addCateForm:{
        //将要添加的分类的名称
        cat_name:'',
        //父级分类的ID
        cat_pid: 0,
        //分类的等级默认要添加的是一级分类
        cat_level: 0,
      },
      //分类表单的验证规则对象
      cateFormRules:{
        cat_name:[
          {required:true, message:'请输入分类名称', trigger:'blur'}
        ]
      },
      //父级分类的列表
      parentCateList:[],
      //指定级联选择器配置对象
      cascaderProps:{
        expandTrigger:'hover',
        value:'cat_id',
        label:'cat_name',
        children:'children',
        checkStrictly:true
      },
      //选中的父级分类的id数组
      selectedKeys:[],
      
      //编辑对话框的显示与隐藏
      editCateDialogVisible:false,
      editCateForm:{
        //将要添加的分类的名称
        cat_name:'',
        //父级分类的ID
        cat_pid: 0,
      }
    }
  },
  created(){
    this.getCateList()
  },
  methods:{
    //获取分类数据
    async getCateList(){
      const {data:res} = await this.$http.get('categories',{params: this.querInfo})
      if(res.meta.status !== 200){
        return this.$message.error('获取分类数据失败')
      }
      //把数据列表赋值给catelist
      this.catelist = res.data.result
      //为总数据条数赋值
      this.total = res.data.total
    },
    //监听pagesize改变
    handleSizeChange(newSize){
      this.querInfo.pagesize = newSize;
      this.getCateList();
    },
    //监听pageNum的改变
    handleCurrentChange(newPage){
      this.querInfo.pagenum = newPage
      this.getCateList()
    },
    //点击按钮展示添加分类对话框的显示
    showAddCateDialog(){
      //先获取父级分类的数据列表
      this.getParentCateList()
      //展示对话框
      this.addCateDialogVisible = true
    },
    //获取父级分类的数据列表
    async getParentCateList(){
      const {data:res} =await this.$http.get('categories',{
        params:{ type:2 }
      })
      if(res.meta.status !==200) return this.$message.error('获取父级分类失败')
      //console.log(res.data)
      this.parentCateList = res.data
    },
    //选择项发生变化触发这个函数
    parentCataChange(){
      //console.log(this.selectedKeys)
      //如果selectedKeys数组中的length大于0，证明选中的父级分类
      //反之就说明没有选任何父级分类
      if(this.selectedKeys.length > 0 ){
        //父级分类的id
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        //为当前分类的等级赋值
        this.addCateForm.cat_level = this.selectedKeys.length
      }else{ 
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0 
      }
    },
    addCate(){
      //console.log(this.addCateForm)
      this.$refs.addCateFormRef.validate(async valid => {
        if(!valid) return
        const {data:res}= await this.$http.post('categories', this.addCateForm)
        if(res.meta.status !== 201) {
          return this.$message.error('添加分类失败')
        }
        this.$message.success('添加分类成功！')
        this.getCateList()
        this.addCateDialogVisible = false
      })
      // const {res:data} = await 
    },
    //监听对话框的关闭事件，重置表达那数据
    addCataDialogClosed(){
      //重置表单
      this.$refs.addCateFormRef.resetFields()
      this.$refs.addCascader.panel.activePath = []
      this.$refs.addCascader.panel.syncActivePath()
    },
    //编辑
    async editCataShow(cataInfo){
      this.editCateDialogVisible = true
      //查询该分类信息 
      const {data:res} = await this.$http.get(`categories/${cataInfo.cat_id}`)
      if(res.meta.status !== 200) return this.$message.error('查询信息失败')      
      this.editCateForm.cat_name = res.data.cat_name
      this.editCateForm.cat_pid = res.data.cat_id
    },
    async editCata(){
      console.log(this.editCateForm.cat_pid)
      const {data:res} = await 
        this.$http.put(`categories/${this.editCateForm.cat_pid}`,{
          cat_name:this.editCateForm.cat_name
        })
        if(res.meta.status !== 200) return this.$message.error('编辑失败')
        this.$message.success('编辑成功')
        this.getCateList()
        this.editCateDialogVisible = false
        this.editCateForm.cat_name = ''
        this.editCateForm.cat_pid = 0
    },
    editCataDialogClosed(){
      this.editCateDialogVisible = false
    },
    //删除
    deleteCataForm(rowInfo){
      // console.log(rowInfo.cat_id)
      this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(async () => {
          const {data:res} = await this.$http.delete(`categories/${rowInfo.cat_id}`)
          if (res.meta.status !== 200) return this.$message.error('删除失败')
          this.$message.success('删除成功')
          this.getCateList()
        });
    },
  },
  
}
</script>

<style lang="less" scoped>
.tree-table{
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}


</style>
